EBL Rechargeable 9V Batteries, 5400mWh USB 9V Lithium Rechargeable Battery (9V Batteries- 4 Pack)

I decided to test the performance of this battery by first depleting it completely, then recharging it while measuring the voltage at scheduled intervals. (See attached photo). Note that my multimeter gives the depleted voltage in millivolts so it’s actually reading 0.0002V. But after just five minutes on the charger, it already came back to 6.97V. From there the voltage inched it’s way back up, but it really didn’t change substantially. It’s not perfectly constant, but this battery gives a very nice, steady performance over its life and it dies abruptly once it’s been depleted.I also wanted to test the longevity of this battery compared to some popular alternatives. I tested this against a Duracell 9V alkaline battery and Energizer’s Ultimate Lithium 9V battery by putting all 3 in a 9V flashlight to see how each one performs under a constant drain.- Duracell Alkaline: Given the way an alkaline battery gradually diminishes, and my flashlight becomes gradually dimmer as it dies, it wasn’t easy to discern a reasonable cutoff voltage where I called it dead. So I decided to measure how long it takes to drain down to 7V, because that’s about where most of my 9V devices fizzle out anyway. In my flashlight, this took approximately 12 1/2 hours.- Energizer Ultimate Lithium: This one also held a fairly steady voltage. Even now it shows over 7V on no load, but it can’t draw any meaningful current anymore. I got about 18 1/2 hours of use out of it. Not bad, but disappointing considering the high price.- EBL 9V Lithium: By far this was the most straightforward to measure. It brightly lit my flashlight, and died abruptly at 13 1/2 hours.So this ran about 8% longer than the Duracell did. Energizer Ultimate Lithium ran about 37% longer, but it’s expensive and non-rechargeable. As of this writing, this product is listed at $6.25 per battery. The Duracell and Energizer are listed here on Amazon at $3.50 and $7.19, respectively. At these prices/ lifespans this rechargeable battery pays for itself in about 1.65 charge cycles compared to the Duracell, and 1.2 charge cycles compared to the Energizer.I recognize that this has been less of a traditional review, and more of a data presentation, so I thought I should add here that I’m very happy with these. They performed very well over a charge cycle, and the lifespan exceeded the alkalines that I used. Plus it costs next to nothing to recharge them, so it’s a great money saver. The USB recharge is fast and convenient. This is very innovative, and I’m rapidly phasing out my old disposable batteries.Edit: 11/10/2022I bought these a little over 2 years ago and they’re still going strong. As I noted in my original review, these have a little over 8V on a full charge, then they discharge to about 7 volts before they die. This is fine for all of my applications (mostly tools) but if you have a more sensitive device, I would recommend Energizer’s NIMH rechargeable battery. The downside is that they have less energy density and you have to buy a special charger for them, losing the convenience of this USB charging system. (The Energizer and EBL chargers have both worked well for me). But if you do need something that’s a little higher voltage, the NIMH maintains 8.4V all the way to the very end of its charge cycle.

These so far have lasted longer than your standard battery pretty charge and charge very fast. Each set comes with a charger cable that charges 4 batteries each.Potential savings if batteries hold up as long as claimed is in the thousands per set of batteries.They currently only have 4 packs which is really only enough for 1 maybe 2 devices. Larger packs with incremental price breaks would be great.I did get 1 battery that the head was soldered slightly offset so it doesn't fit into really tight battery compartments. Sometimes rotating it will let it fall in. Very small inconvenience and does not appear to be a common quality issue but my sample is small. I don't have many devices that have a small battery compartment either.PROS:1) Long life per charge2) Easy indicator light for charge status (only while charging)3) Standard micro USB port to charge in case the provided charger is lost or damaged.4) The provided charger cable is actually a dongle to charge up to 4 batteries at once with 1 charger block.5) Potential to save thousands over the life of each set of batteries compared to non rechargeable batteries.6) No specialty charging unit like traditional rechargeable batteries7) The provided cases are great for storage between users and charges.CONS:1) Very high price per battery2) No purchase options above 4 batteries at this time.3) Each order comes with a charger dongle (I have 16 batteries from 5 orders and 5 dongles)4) The stress of worrying that someone will toss them and replace with standard batteries not realizing they are rechargeable.

UPDATE: After having issues with my last order of 9V lithiums and documenting them, EBL reached out to me (not the other way around!) and immediately replaced it. I now have good working smoke detectors. I'm VERY happy with the exceptional service and it has changed my views 180 degrees on the company.LAST REVIEWI bought a bunch of these for the numerous smoke detectors in my 12 room B&B. For years, I have been using Alkalines and I've been slowly switching to lithium rechargeables. I had good luck with other Lithium rechargeables but tried these EBL as these are 1/2 the price. I got these in May and charged them up. It's now the middle of July (technically less than 2 months later) and two of my smoke detectors are beeping - signifying the need for change of batteries. I'm not happy with the really bad performance. My other lithiums and the alkalines lasts AT LEAST a year but the EBL is only 2 months. I will recharge again and see how these fare. If it improves, I'll update this review.

I travel with a Traveler EC-1 guitar, and a Fender Mini Tonemaster amplifier. The amplifier takes a single 9V battery, which these seem to have no trouble powering for several hours of hotel room practice. The guitar, however, has an ESP humbucker pickup which requires a 9V battery. When the non-rechargeable battery depleted, I switched to one of these rechargeable, only to get a high pitched tone out of the guitar. (It sounds like a square wave).I surmise this has a voltage regulating circuit making the noise. I'll try adding a capacitor parallel to the battery and see if that solves the issue. Meanwhile, I will use non rechargeable batteries in my "hatchet"

If you need rechargeable 9V batteries then these are the ones you should choose. The capacity is the best, the build quality is good, and the charging is fast and effective.

fantastic product, they feel a bit cheap but they last very long and charge quickly. they have saved my a ton of money and are literally just the same as normal 12v batteries but rechargeable

Great